Process for filtering elements



"Nov. 6,1928. 1,691,001 H. A. VALLEZ V PROCESS FOR FILTERING ELEMENTS Filed May 19. 1922 2 Sheets-Shet 1 IF j? Q k m w 8 S R a x Q 1 INVENY OR.

A TTORNEY.

Nov. s, 1928. 1,691,001

1 H. A. VALLEZ PROCESS FOR FILTERING ELEMENTS Filed May 19, 1922 I 2 Sheets-Sheet 2 U /J a /5 57 5 INVENTOR.

e 11 Kat/e2.

- A TTORNEY.

Pests 1 1..v-.6,-1928." 1,691,001

UNITED STATES PATENT OFFICE.

HENRY A. VALLEZ, or BAY CITY, MICHIGAN. rnocfass FOB rrmnnme ELEMENTS.

Application filed May 19, 1922. Serial No. 562,257.

4 This invention relates toa process for for the even coating of the filtering surface, i forming a deposit or coating on the face of otherwise sections of the filtering element a filtering screen, and. particularly to a 'will be unevenly coated, and numerousleaks' process for forming a coating of uniform will develop, as with this type of filter a pres thickness of the face thereof. 7 sure is maintained within the shell.

, One object of the invention is to evenly and As stated this invention is directed to the quickly coat the filtering surface of the filtermanner of coating the filtering element, and ing element so that every part of the saidele- I do not deem itnecessary to specifically dement will be'of uniform thickness, and therescribe the construction of the filter, nor the by provide perfect filtration. method of driving the said element, as this 60 4 Another object is ,to provide aprocess for is not essential and f rms no part of the w the filtration of liquids, in which the coating present invention.. or filtering medium can be mixed with clean The filter comprises a cylindrical shell filtered liquid, forming a mixture whichcan 0 r cas ng 1 split on the horizontal center be pum d'into the filter, and which will lme 2 into two halves, which are adapted to' 65 evenly f rm on the filtering element in a hobe securedtogether by means of bolts 3. A

mogeneous mass, and to any desired thickfiltering element l is rotatably mounted in ness, d hi h (33,11, wh n laden. with the this shell, and comprises a series of frames 5 refuse, etc, be dissolved into its original mounted on a hollow shaft 6, one-endofthe state, to allow it to be returned to a suitable hollow shaft having a worm wheel mounted m receptacle for washing, preparatory to again thereon,'and which is adapted to be driven in being used. I any suitable manner, and from any suitable A further object is to provide a process in source of power.

which the filterlng medium can be removed The frame proper comprises a pair of.

and washed without opening the filter. spaced apart screens 7 and 8 secured to the I 6 parts throughout the several views thereof. pipe 19 is provided in the top of the ell The above and other objects will appear hub 9, which is provided with slotted openas. the specification progresses, reference be-. ings communicating with similar openings ing had to the accompanying drawings in formed in the hollow shaft to provide for which like reference numerals indicate like the passage of the filtered juices. A s ray" In the draw1ngs:- I 'Fig. 1' is a top plan view illustrating the com ressed air connections 11 and 12 respecarrangement of the tanks and filter for carrytive y, suitable valves being provided for m out-my improved process.- controlling, the flow of air or water therein. 35 ig. 2 1s an enlarged view of the filter Small discharge openings are provided in I proper. this pipe 10 for directing the spray against F ig. 3 is an end view thereof. the sides of the screens as they rotate, and v Fig. 4 is a view illustrating the filterin When it is desired toclean the cake therefrom. 1 medium formed on the face of the filter, an A. perforated p1pe 13 is mounted n the Fi 5 is an enlarged fragmentary sec-j lower halfof the shell, and this p1pe is also i m i edge View of one of the filtering provided with the an and, water connect ons frames. r 14 and 15 respectively, and for a purpose to Referrin now particularly to the drawpr n ly f ings, the filter illustrated therein is termed .Heretofore it has been customary to use 45 a rotary filter, and is a filter'in which the cloths on the filtering elements, but this refiltering screens or elements rotate inside of. quired considerable laborto attach each cloth a shell or'casing into which the juice to be as its respective frame, and the cloths wear, filtered is injected. out in the due course of time, also, leaks In a process of thisnature, it-is essential 1 develop when the cloths are not uniform, or 0 that the filtering element rot-ate to provide wear 1n certain spots. In my improved 10 H and this pipe is provided with the water and circulating pump municating with shaft and into a branch connection 32 leading through the pipe process this labor is eliminated, and the bulk of the cloth cost is saved.

In practise I use a fine paper pulp, or a bleached sulphite pulp. This I place in a tank or receptacle 16, and boil and soak until the mass is entirely disintegrated .and Washed, I then drain the water into a sewer, place the pulp in a tank 17, and mix it with clear filtered juice until it is of a consistency to readily flow. The valve 18 in the pipe 19 is then opened, allowing the mixture to enter the pipe line20, and flow to a conventional 21 through a pipe 22, and thence to the pipe line 23 which is provided withbranehes 23 communicating with the filter, a valve 24 being provided in the line 22 as shown. The pump thoroughly and mixes the pulp mixture forcing it to the ipe line 23, and into the filter through the branches asdescribed. 25 also communicates with the pipe line 23, and av valve 26 is provided for controlling the flow of liquid therein. When the mixture is injected into the filter, it will filter through the filtering element, and deposit the pulp fibre on the face thereof. Naturally some of the pulp passes through the filter at first, circulating through the hollow shaft, and thence through the pipe line 27 to the tank 17 but continuous circulation will re. idly build u the coating to the desired thic ess. A va vided in this ipe line 27 for controlling the .fiow of li ui .While the mixture is circulating, and the deposit or coating is being formed on the filtering element, the frames are slowly rotating, and this notation of the frames combined with the continuous circulation of the pulp mixture insures a perfect and uniform thickness or deposit of the filtering medium or pulp on the frames. The washed and then mixed with clear water if desired. In this event the water can be forced out by compressed air before beginning filtration, by mixing with clear filtered liquid. This iseliminated and a clean filtering medium is secured.

After the filtering medium is deposited'on the frames, the valve 28 is closed, and the valve 29 which is located in the pipe 30 comthe supply tank 31 is then opened. The Juice to be. filtered flows to the -pumpx passing t frames, thence flowing through the hollow to a suitable tank or receptacle (not shown), the usual valve 32" being provided as shown. When the filter becomes dirty the valves 32, 24, 22 and 29 are again closed, the juice in the filter is forced back to the supply tank line 33 by compressed air introduced mto the hollow shaft through the pipe 32, and water is introduced through agitates A water connection ve 28 is also proj in circulating a mixture 0 on the filtering element pulp can be first 21 and is forced into the filter, rough the filtering medium on the,

the connection 25,.the valve 36 in the line 35 is o ened, and asthis water passes through the lter, it takes up the juice in the filtering element. arate tank (not shown). The valve 36 is then closed and the filter filled about one half full of water; The steam and compressed air connections are then opened, the steam heating the water in the filter, while the air sets up a violent agitation therein. The valves 11 and 12 are then opened, and direct a spray aglainst the sides of the frames, and as the tering element slowly rotates, the filtering medium rapidly disintegrates, and is washed cleanly from the frames. The mixture within the filter is then in its original state. The valve 24 is 22 is then closed, and the mixture is forced to the pulp washer 16 through the pipe line 34. The pul is then thoroughly, washed, after which t e valve 37 is opened, and the mixture is again introduced to the tank 17 deposited on the preparatory to being again frames.

A pipe 38 leads filter to the sewer, a valve 39 being provided as shown, and when water can be directed to the sewer. valves on the other communicating connections are closed accordingly, and the filter is then blown out with compressed air.

From the foregoing description it will be obvious that I have perfected an improved process for evenly coating the surface of a rotating filtering element.

.What I claim is 1. Aprocess for filterin which consists pulp and liquid through a rotating filtering element to form a uniform coating of plulp to provide a filter mat for said element,

tering juices under pressure, through the filtering element after the formation of the filter mat until the latter becomes clogged, reversing the flow of the juices to remove the juices in the filter and return the said juices tothe source of supply, removing the ulp from the clogged filtering element wa ing the pulp after such removal, and finally recoating the filtering element witlr the washed pulp by circulating a mixture of the same and liquid throu h the filteringelement.

2. A process or filterin which consists in mixing pulp the mixture continuousl through a rotating filtering element to orm thereon a uniform coating of pulp to provide a filter mat. filtering juices under pressure until the filter mat becomes clogged, reversing the flow of the juices to remove the juices in the filter and return the said juices to the source of supply, removing the pulp from the clog ed filtering element, washing the pulp a ter This water then flows to a sep-' then'opened, and valve from the bottom of the the filter is washed, this The with clean uice, circulating such removal, and finally recoating the filter- 5 the mixture continuouslythrough a rotating filtering element under pressure to deposit the pulp on the filtering element to produce nv filter mat of uniform thickness, filtering juices under pressure until the filter- 10 ing mat becomes clogged, reversing the How of the juices to remove the juices in the filter and return the said juices to the source of supply, removing the coatin from the clogged filtering element, washing the pulp after such removal, mixing the Washed pulp with clean juice, and finally recoating the filtering element by continuously circulating the latter through the filtering element While the same is being rotated.

. In testimony whereof I afiix my signature.

HENRY A. VALLEZ. 

